ER25 MT2

[Franco ConvertiniParticipant @francoconvertini28916]

I use the ER25 MT2 for some work on the S7 lathe
When I have to remove it from the chuck it doesn't come out and I have to hammer on the rear tie rod to get it out.
This doesn't seem like a good thing to me and I would like to find an alternative system.
What system do you use to make the cone come off the spindle?

Thank you

[Franco ConvertiniParticipant @francoconvertini28916]

What system do you use to make the cone come off the spindle?

[John PParticipant @johnp77052]

Hi ,
First of all don't do up the drawbar so tightly,when i use
MT tooling in the lathe spindle to remove i remove the drawbar
and use about a 2 foot length of 1/2" steel rod, hold on to the
piece of tooling and slide through the rod and hit on the back of
the taper tooling ,works every time.

John

[Nick WheelerParticipant @nickwheeler]

My min-mill is a morse 3 taper. The tools I use, from a drill chuck, through ER32 holder to a face mill all release with a sharp tap from a decent size hammer just like morse tooling always did. I have better things to do than faff about with a self releasing arrangement.

[Peter Cook 6Participant @petercook6]

My SX1LP mill uses MT2 taper. With myER16 adapter I simply take the nut off, slip a piece of tube over the threads so that it meets on the bottom of the quill, then put an old ER16 nut on the threads and tighten. Pops the adapter out easy.

[old martParticipant @oldmart]

As long as the length of thread engagement of the drawbar in the tool is as long as possible, then a smart rap with a copper hammer after slackening off a couple of turns is acceptable.

[JasonBModerator @jasonb]

You would be better off using a collet chuck that either screws onto the Myford spindle nose or one that fits onto a backplate threaded to suit the myford. The added bonus if you can holed long lengths as the work can still pass through the spindle as no drawbar to block it

[old martParticipant @oldmart]

I use one of Jason's collet plates to hold the mills er25 tooling in the smart & Brown lathe.

[not done it yetParticipant @notdoneityet]

I would use wedges, every time, if a tap is insufficient to dislodge it.

[Roderick JenkinsParticipant @roderickjenkins93242]

Franco,

I have a similar problem to you. My milling machine has a Myford nose thread on the spindle. My solution is to make a nut with the Myford 1 1/8" x 12 thread that screws on to the spindle before attaching the ER collet chuck. With the draw bar loosened, unscrewing the nut pushes the chuck out of the taper. The through hole of the nut is just larger than the big end of a MT2.

The nut you can see on the horizontal spindle is a nose protector and the through hole is bigger than the diameter of the collet chuck so that doesn't work as a remover although it does remove the horizontal arbor which has a bigger diameter than the ER25 chuck.

HTH,

Rod

[Clive FosterParticipant @clivefoster55965]

Morse is a self holding taper so, assuming the mating surfaces are making clean contact, the torque needed to keep the shank in place is quite modest. Probably 10 ft/lb or so will suffice.

By comparison R8 is not self holding yet, according to Bridgeport who invented the thing, 35 ft lb is ample to close a collet on a milling cutter shank so it won't spin. Maybe 20 ft lb would suffice to hold a solid R8 shank but, having calibrated my pull, I use same gentle heave for both.

It is said that MT shanks having a relieving groove, usually around 1/2" to 3/4" wide, are easier to extract yet exhibit no loss of holding / driving power.

Clive

[Howard LewisParticipant @howardlewis46836]

What a splendid, non damaging method Rod! An excellent idea.

Howard

[Franco ConvertiniParticipant @francoconvertini28916]

Thanks for advice. They have been very helpful. I saw that Roderick has a good system with that nut.

[bernard towersParticipant @bernardtowers37738]

The system that Roderick J uses is similar to the one used by Clarkson for their MT 2 collet chucks which had a fine thread at the rear of the collet chuck, the drawbar is tightened and the the nut is tightened by hand up to the machine spindle adding stiffness to the collet chuck as Clarkson thought the MT 2 spindle a little flimsy for big cuts. I use this nut in a similar way to Roderick. I also use the same system as Roderick on my sherline mill.

[Darakhshan MuqaddasParticipant @darakhshanmuqaddas23860]

My min-factory is a morse 3 shape. The devices I use, from a drill throw, through ER32 holder to a face factory all delivery with a sharp tap from a respectable size hammer very much like morse tooling consistently did. I have preferred activities over faff about with a self delivering game plan.

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